Through the analysis of a simple two-level model, we show how and to what extent structures posse... more Through the analysis of a simple two-level model, we show how and to what extent structures possessing vectorial symmetry act as pumps in the presence of dissipation. The relevance to new separation concepts and protein motor assemblies is discussed.
The European physical journal. E, Soft matter, 2015
We use the theory of active gels to study theoretically the merging and separation of two actin d... more We use the theory of active gels to study theoretically the merging and separation of two actin dense layers akin to cortical layers of animal cells. The layers bind at a distance equal to twice the thickness of a free layer, thus forming a single dense layer, similar in this sense to a lamellipodium. When that unique layer is stretched apart, it is resilient to break apart up to a critical length larger than twice the thickness of a free layer. We show that this behavior can result from the high contractile properties of the actomyosin gel due to the activity of myosin molecular motors. Furthermore, we establish that the stability of the stretched single layer is highly dependent on the properties of the gel. Indeed, the nematic order of the actin filaments along the polymerizing membranes is a destabilizing factor.
Dynamic light scattering measurements on oriented samples of dilute lyotropic smectics have been ... more Dynamic light scattering measurements on oriented samples of dilute lyotropic smectics have been performed. The hydrodynamics of a two-component smectic A is reviewed and applied to describe the fluctuation spectrum in our multi-component samples. The layer compressibility modulus (at constant chemical potential) [`</font >(B)]\bar B is extracted from the anisotropic dispersion relation of the so-called slip mode, which arises from
Through the analysis of a simple two-level model, we show how and to what extent structures posse... more Through the analysis of a simple two-level model, we show how and to what extent structures possessing vectorial symmetry act as pumps in the presence of dissipation. The relevance to new separation concepts and protein motor assemblies is discussed.
The European physical journal. E, Soft matter, 2015
We use the theory of active gels to study theoretically the merging and separation of two actin d... more We use the theory of active gels to study theoretically the merging and separation of two actin dense layers akin to cortical layers of animal cells. The layers bind at a distance equal to twice the thickness of a free layer, thus forming a single dense layer, similar in this sense to a lamellipodium. When that unique layer is stretched apart, it is resilient to break apart up to a critical length larger than twice the thickness of a free layer. We show that this behavior can result from the high contractile properties of the actomyosin gel due to the activity of myosin molecular motors. Furthermore, we establish that the stability of the stretched single layer is highly dependent on the properties of the gel. Indeed, the nematic order of the actin filaments along the polymerizing membranes is a destabilizing factor.
Dynamic light scattering measurements on oriented samples of dilute lyotropic smectics have been ... more Dynamic light scattering measurements on oriented samples of dilute lyotropic smectics have been performed. The hydrodynamics of a two-component smectic A is reviewed and applied to describe the fluctuation spectrum in our multi-component samples. The layer compressibility modulus (at constant chemical potential) [`</font >(B)]\bar B is extracted from the anisotropic dispersion relation of the so-called slip mode, which arises from
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Papers by Jacques Prost